package network;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.Socket;
import java.util.Scanner;

public class TcpEchoClient {

    private Socket socket = null;

    public TcpEchoClient(String serverIp, int port) throws IOException {
        socket = new Socket(serverIp, port);
    }

    public void start() {
        Scanner scanner = new Scanner(System.in);
        try (InputStream inputStream = socket.getInputStream();
             OutputStream outputStream = socket.getOutputStream()) {
            PrintWriter printWriter = new PrintWriter(outputStream);
            Scanner scannerFromSocket = new Scanner(inputStream);
            while (true) {
                // 1.从键盘上读取用户输入的内容
                System.out.print("->");
                String request = scanner.next();
                // 2.把读取的内容构造成请求，发送给服务器
                // 注意这里发送 是带有换行
                printWriter.println(request);
                printWriter.flush();  // 此处需要手动刷新缓冲区
                // 3.从服务器读取相应内容
                String response = scannerFromSocket.next();
                // 4.把相应结果显示到控制台上
                System.out.printf("req: %s, resq: %s\n", request, response);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) throws IOException {
        TcpEchoClient tcpEchoClient = new TcpEchoClient("127.0.0.1",9090);
        tcpEchoClient.start();
    }
}
